Earthquakes on September 16, 2021
293
EARTHQUAKES on September 16, 2021
24-hour UTC period · USGS data
LARGEST: M5.6 — 181 km SE of Chignik, Alaska
37 km deep · 2 people felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
5
M4.0–4.9
47
M3.0–3.9
6
M2.0–2.9
58
M1.0–1.9
177
Activity Summary
293
Total earthquakes
~250
Daily average
Normal
Activity level
5
M5.0+ events
Significant Earthquakes (M4.5+)
5.6
181 km SE of Chignik, Alaska
17:51 UTC · 36.8 km deep
Felt by 2
5.3
South Georgia Island region
01:20 UTC · 10.0 km deep
5.1
200 km SE of Chignik, Alaska
23:05 UTC · 33.0 km deep
Felt by 1
5.1
South Sandwich Islands region
04:58 UTC · 35.0 km deep
5.0
Kermadec Islands region
00:06 UTC · 20.7 km deep
4.9
South Sandwich Islands region
22:51 UTC · 35.0 km deep
4.9
south of the Fiji Islands
19:42 UTC · 512.0 km deep
4.9
52 km NNE of Nanao, Japan
09:42 UTC · 10.0 km deep
Felt by 25
Earthquake Map — September 16, 2021
All Earthquakes — September 16, 2021
Showing 30 of 116 (filtered from 293)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-09-16 2021-09-16 23:45:07 UTC | 2.6ml | 103 km ESE of Sand Point, Alaska 54.900°, -159.059° | 29.7 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.6 earthquake 103 km ESE of Sand Point, Alaska with origin time 23:45 UTC on September 16, 2021. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 23:38:18 UTC | 2.7ml | 103 km SSE of Sand Point, Alaska 54.505°, -159.786° | 20.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.7 seismic event took place 103 km SSE of Sand Point, Alaska on September 16, 2021 at 23:38 UTC. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 23:36:12 UTC | 4.4mb | 86 km WSW of Hihifo, Tonga -16.222°, -174.553° | 189.9 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.4 earthquake 86 km WSW of Hihifo, Tonga at 23:36 UTC on September 16, 2021. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 23:27:45 UTC | 3.3ml | 118 km SSE of Sand Point, Alaska 54.322°, -159.924° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 23:27 UTC on September 16, 2021, a magnitude 3.3 tremor occurred 118 km SSE of Sand Point, Alaska. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 23:05:07 UTC | 5.1mww | 200 km SE of Chignik, Alaska 54.942°, -156.304° | 33.0 km | 1 | II | green | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 5.1 earthquake 200 km SE of Chignik, Alaska with origin time 23:05 UTC on September 16, 2021. A tsunami evaluation was automatically initiated given the magnitude and location. Coming 5 hours after a magnitude 5.6 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M5.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 22:51:25 UTC | 4.9mb | South Sandwich Islands region -59.913°, -26.205° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.9 earthquake in the South Sandwich Islands region at 22:51 UTC on September 16, 2021. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 22:48:52 UTC | 2.6ml | 126 km S of Sand Point, Alaska 54.212°, -160.185° | 13.7 km | - | - | - | ✓ Reviewed | USGS → |
On September 16, 2021, worldwide seismic activity registered a magnitude 2.6 earthquake 126 km S of Sand Point, Alaska at 22:48 UTC. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 22:45:24 UTC | 4.8mww | 5 km WSW of San Baltazar Guelavila, Mexico 16.768°, -96.351° | 42.9 km | 12 | - | - | ✓ Reviewed | USGS → |
A magnitude 4.8 seismic event took place 5 km WSW of San Baltazar Guelavila, Mexico on September 16, 2021 at 22:45 UTC. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 22:44:06 UTC | 2.8ml | 58 km SSW of Cantwell, Alaska 62.935°, -149.527° | 71.4 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.8 earthquake 58 km SSW of Cantwell, Alaska with origin time 22:44 UTC on September 16, 2021. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 22:41:51 UTC | 2.4ml | 12 km ENE of P?hala, Hawaii 19.240°, -155.371° | 31.0 km | - | - | - | Auto | USGS → |
September 16, 2021 brought a magnitude 2.4 earthquake 12 km ENE of P?hala, Hawaii, logged at 22:41 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.9 earthquake that occurred about 22 hours earlier. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 22:32:13 UTC | 4.8mb | South Sandwich Islands region -60.548°, -24.640° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
September 16, 2021 brought a magnitude 4.8 earthquake in the South Sandwich Islands region, logged at 22:32 UTC. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 22:09:05 UTC | 2.3ml | 36 km NNW of Toyah, Texas 31.597°, -104.001° | 7.6 km | - | - | - | ✓ Reviewed | USGS → |
At 22:09 UTC on September 16, 2021, a magnitude 2.3 tremor occurred 36 km NNW of Toyah, Texas. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 21:58:14 UTC | 4.5mb | 79 km SSE of Kokopo, Papua New Guinea -5.014°, 152.536° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
September 16, 2021 brought a magnitude 4.5 earthquake 79 km SSE of Kokopo, Papua New Guinea, logged at 21:58 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 21:53:51 UTC | 2.0ml | 4 km ENE of P?hala, Hawaii 19.219°, -155.437° | 31.2 km | - | - | - | Auto | USGS → |
The USGS recorded this magnitude 2.0 earthquake 4 km ENE of P?hala, Hawaii at 21:53 UTC on September 16, 2021. It arrived roughly 21 hours after a larger magnitude 2.9 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 21:51:57 UTC | 2.9ml | 11 km SSE of Susitna North, Alaska 62.063°, -149.778° | 42.0 km | 2 | - | - | ✓ Reviewed | USGS → |
A magnitude 2.9 seismic event took place 11 km SSE of Susitna North, Alaska on September 16, 2021 at 21:51 UTC. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 21:45:18 UTC | 2.8md | 32km ENE of Dardanelle, CA 38.473°, -119.512° | 4.4 km | 1 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.8 earthquake 32km ENE of Dardanelle, CA at 21:45 UTC on September 16, 2021. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 21:17:29 UTC | 2.1ml | 4 km E of P?hala, Hawaii 19.209°, -155.441° | 32.5 km | - | - | - | Auto | USGS → |
The USGS recorded this magnitude 2.1 earthquake 4 km E of P?hala, Hawaii at 21:17 UTC on September 16, 2021. Coming 21 hours after a magnitude 2.9 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 21:16:51 UTC | 2.1ml | 3 km E of P?hala, Hawaii 19.207°, -155.444° | 32.4 km | - | - | - | Auto | USGS → |
This magnitude 2.1 event was detected 3 km E of P?hala, Hawaii on September 16, 2021, with origin time 21:16 UTC. It arrived roughly 21 hours after a larger magnitude 2.9 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 21:16:26 UTC | 2.8ml | 162 km S of False Pass, Alaska 53.396°, -163.412° | 22.1 km | - | - | - | ✓ Reviewed | USGS → |
On September 16, 2021, worldwide seismic activity registered a magnitude 2.8 earthquake 162 km S of False Pass, Alaska at 21:16 UTC. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 20:59:43 UTC | 2.6ml | 30 km NNE of Valdez, Alaska 61.402°, -146.225° | 27.6 km | - | - | - | ✓ Reviewed | USGS → |
At 20:59 UTC on September 16, 2021, a magnitude 2.6 tremor occurred 30 km NNE of Valdez, Alaska. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 20:57:02 UTC | 2.0ml | 22 km NNW of P?hala, Hawaii 19.396°, -155.542° | 3.9 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 seismic event took place 22 km NNW of P?hala, Hawaii on September 16, 2021 at 20:57 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 20:50:42 UTC | 4.4mb | 88 km WNW of Panguna, Papua New Guinea -5.992°, 154.757° | 145.9 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.4 event was detected 88 km WNW of Panguna, Papua New Guinea on September 16, 2021, with origin time 20:50 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 20:46:25 UTC | 2.0ml | 74 km NE of Chignik, Alaska 56.693°, -157.429° | 2.3 km | - | - | - | ✓ Reviewed | USGS → |
September 16, 2021 brought a magnitude 2.0 earthquake 74 km NE of Chignik, Alaska, logged at 20:46 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 19:57:27 UTC | 4.1mb | 133 km SE of Mil’kovo, Russia 53.921°, 160.193° | 78.2 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.1 seismic event took place 133 km SE of Mil’kovo, Russia on September 16, 2021 at 19:57 UTC. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 19:49:07 UTC | 2.1ml | 30 km S of Sand Point, Alaska 55.059°, -160.522° | 49.2 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 seismic event took place 30 km S of Sand Point, Alaska on September 16, 2021 at 19:49 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 19:42:30 UTC | 4.9mb | south of the Fiji Islands -23.846°, -179.672° | 512.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.9 event was detected south of the Fiji Islands on September 16, 2021, with origin time 19:42 UTC. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 19:19:55 UTC | 4.5mb | Sulawesi, Indonesia -1.266°, 120.585° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 16, 2021 at 19:19 UTC, a magnitude 4.5 earthquake struck near Sulawesi, Indonesia. Coming 11 hours after a magnitude 4.8 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 18:35:03 UTC | 3.2ml | 191 km SE of Chignik, Alaska 55.016°, -156.366° | 34.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 3.2 earthquake 191 km SE of Chignik, Alaska at 18:35 UTC on September 16, 2021. This event falls inside the aftershock decay of a nearby magnitude 5.6 earthquake that occurred about 1 hours earlier. The event was offshore. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 18:34:55 UTC | 4.6mb | 98 km WSW of Illapel, Chile -31.813°, -72.190° | 10.0 km | 7 | - | - | ✓ Reviewed | USGS → |
On September 16, 2021, worldwide seismic activity registered a magnitude 4.6 earthquake 98 km WSW of Illapel, Chile at 18:34 UTC. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-16 2021-09-16 17:51:55 UTC | 5.6mww | 181 km SE of Chignik, Alaska 55.071°, -156.499° | 36.8 km | 2 | III | green | ✓ Reviewed | USGS → |
On September 16, 2021 at 17:51 UTC, a magnitude 5.6 earthquake struck 181 km SE of Chignik, Alaska. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. It is the largest earthquake currently listed for worldwide seismic activity on September 16, 2021. See the M5.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
Legend:
Mag: Magnitude (magType = ml, mb, mw, etc.)
Felt: Number of DYFI felt reports
MMI: Modified Mercalli Intensity (I-X+)
Alert: PAGER alert level
Depth: Shallow (<70km), Intermediate, Deep (>300km)
Status: Auto = preliminary, Reviewed = verified by seismologist
Click any row to see additional technical details.
About This Page
This page shows all earthquakes recorded by the USGS Earthquake Hazards Program during the 24-hour UTC period on September 16, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.